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Old 02-13-2019, 08:02 PM
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Tony
 
Join Date: Oct 2005
Location: Bandon, Oregon
Posts: 981
Custom Pistons feedback

Any one here had custom pistons made and what was your experience? The more I think about it I am considering having pistons made for my iron bock 5.6 project instead of using the 5.6 pistons with unknown properties. I think the $1000 or so is worth the peace of mind.
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Tony H
1971 280SE 3.5 Coupe(soon to be 5.6)
European Version
Manual transmission
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Old 02-14-2019, 11:52 PM
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Join Date: Feb 2011
Location: Modesto CA
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Quote:
Originally Posted by Tony H View Post
Any one here had custom pistons made and what was your experience? The more I think about it I am considering having pistons made for my iron bock 5.6 project instead of using the 5.6 pistons with unknown properties. I think the $1000 or so is worth the peace of mind.

Tony,

After a bit of discussion of this with a shop I frequently work with, the starting point is to find rings in the diameter and widths that you want and which will be readily available. Total Seal and Nippon Piston Ring (NPR) may be able to satisfy your requirement. Once the ring package is specified the piston maker can proceed. If the rods are bushed with Ampco 45 the wrist pin diameter can be reduced to a common US pin size such as .927", which in this case would yield a .048" wall thickness pin bushing.

Generally custom forged pistons will be made in 2618 alloy which has very good strength, but which must be run with increased clearance. A few forging blanks are available in 4032 alloy, which is a high silicon content alloy and runs at smaller clearances. Possible piston makers are CP, JE, Wiseco, and Diamond.
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